IRREVERSIBILITY LINE AND THERMAL DEPINNING IN YBa2Cu3O7-δ |
| |
引用本文: | 闻海虎,赵忠贤.IRREVERSIBILITY LINE AND THERMAL DEPINNING IN YBa2Cu3O7-δ[J].中国物理 B,1994,3(12):917-924. |
| |
作者姓名: | 闻海虎 赵忠贤 |
| |
作者单位: | State Key Laboratory for Superconductivity, Institute of Physics, Academia Sinica, Beijing 100080, China;State Key Laboratory for Superconductivity, Institute of Physics, Academia Sinica, Beijing 100080, China |
| |
摘 要: | By measuring magnetic torque moment in a field-sweeping process, the temperature and field dependence of the critical current density j (with a criterion of electric field) and the normalized relaxation rate Q = d lnj/d ln E of a YBa2Cu3O7-δ thin film were obtained. With a minimum current density (jmin = 10A·cm-2) the irreversibility lines at different sweeping rates were determined. It was found that these irreversibility lines cannot be fitted to either the melting line or the vortex-glass transition. All the data can be interpreted by the thermally-assisted-flux-flow model. Further investigation shows that, at irreversible tem-perature and field, Uc is much smaller than kBT, which indicates that the thermal depinning is the real origin of the irreversibility line.
|
|
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
| 点击此处可从《中国物理 B》下载免费的PDF全文 |
|